I dont know if there is other source, but the link you posted is right. And regardless the source some antivirus will always flag it as virus because it changes the game .exe so the antivirus thinks its suspicious to change an .exe. But its is safe in this case because thats what a patch is supposed to do. Tapani explains it here:

Originally Posted by Tapani

It is not the name of a known trojan or virus. It is an generic name for a pattern they have detected in trojans ... their antivirus found a program that opens an .exe file, and overwrites a big pile of carefully selected bytes of code in it. That sure as h*ll appears as suspicious behaviour (in general)! But in this case, that is exactly what a patcher is supposed to do, but Windows Defender cannot know that.

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2018 patch issue

Hi,

Just downloaded ChampMan onto my new PC Laptop and downloaded the 2018 patch - transferred it all into Data with no issues, got the v3-68 error and looked that up and downloaded that patch, got past that error message and the ran into the initializing game data issue. Put myself down as Administrator and enabled compatibility mode to 98, but still getting it. I've been looking over the forums and seeing 'Success!' messages. Is there a little fix I'm missing?